تاثير تغذيه مكمل چربي محافظت شده طي دوره انتقال گاوهاي شيرده هلشتاين بر عملكرد، سيستم ايمني و فراسنجه هاي خوني گوساله هاي آنها

چكيده انگليسي :

Effect of Feeding Protected Fat Supplements During theTransition Period of Holstein Dairy Cows on Performance Immune System and Blood Parameters of their Calves Shahab Mazloum tammeshkk@yahoo com Date of submission 2011 4 26 Department of Animal Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor G R Ghorbani ghorbani@cc iut ac irAbstractOur objective in current study was to investigate the effects of feeding fat supplements rich in linoleicacid ca salt of soybean oil on immune response of Holstein dairy cows in transition period and theircalves performance immune response and blood parameters Twenty four multiparous Holstein dairycows 700 50 kg and 260 days in pregnant n 12 for each treatment were used in a completelyrandomized design Treatment were 1 Control group calves that their dams did not receive fatsupplements and 2 Fat group calves that their dams received fat supplements at 2 of dietary DM Diets were balanced according to NRC 2001 and were isocaloric and isonitrogenous Since 41 d beforeanticipated calving date and in order to minimize the difference among cows and equilibrate their bodycondition scores cows were housed in an individual stalls and fed with farm routine ration Then 21 dbefore anticipated calving date cows were fed dietary treatments as TMR and ad libitum at two equalportions in the morning and evening meals Upon calving cows were milked and colostrums sampled After calving calves were housed in individual stalls and received their dam s colostrums at the rate of10 of body weight for 3 consecutive days Calves had free access to water and starter and received anequal amount of whole milk throughout the experiment Calves performance and immune response werestudied Blood sampling were done on the day of birth 1 3 10 and 21 In order to stimulate calvesimmune system 1 5 cc SRBC 10 shot on the day of 38 and 48 was injected and ten day after eachshot blood sampled Data were analyzed using the MIXED procedure of SAS SAS Institute 2003 Calfwas the specified term for the repeated measures whereas the best covariance structure was compoundsymmetry based on the smallest Bayesian criterion Differences between treatments were declaredsignificant at P 0 05 and means were compared using the Tukey multiple comparison test Feeding fatdid not affect cow s final weight and body weight changes at prepartum period although dry matterintake of cows fed control diet was greater than those of fat group Blood plasma parameters of cowsincluding triglyceride cholesterol very low and high density lipoproteins were not affected bytreatments Results showed that feeding ca salt of soybean oil did not affect colostrums volume and theirrespective constituents Also birth weight was not differed among treatments but calves in fat group hadgreater dry matter intake Average daily gain but not feed efficiency was greater in calves in fat groupcompared to calves in control group Calves in fat group were weaned ten day earlier than that of controlgroup Amount of blood anti body at first and second stimuli and also blood white cells count includinglymphocytes neutrophils eosinophils and monocytes were not affected by treatments Calves in controlgroup had greater amount of blood triglyceride and very low density lipoprotein whereas cholesteroltended P 0 09 to increase in those on fat group High density lipoprotein also was not differed amongtreatments In general supplementing transition diets with ca salts of soybean oil did not stimulateimmune response of born calves but improved intake and average daily gain and thereby shortenedweaning age Key words ca salts of soybean oil calf immune weaning transition period

مظلوم، شهاب

تاثير تغذيه مكمل چربي محافظت شده طي دوره انتقال گاوهاي شيرده هلشتاين بر عملكرد، سيستم ايمني و فراسنجه هاي خوني گوساله هاي آنها

روغن سوياي كلسيمي شده , از شيرگيري